Not A Side Chick by Lani Lynn Vale

Edith “Eddy” Wheeler was having a bad day.
A no good, very bad day.
It’s understandable, really. I mean, there didn’t seem to be anything worse than walking in on your elderly parents doing things no child should ever see. Add into that their proclivities, and Eddy is disgusted and disturbed.
So of course, after seeing the atrocious things her parents—the pastor and pastor’s wife that are supposed to be holy and a teacher of faith—are into, she makes it her life goal to expose them to their masses. The cult-like following her father has will see him for the man he is—an abuser who gets a sick thrill at seeing his girls suffer.
She will no longer allow the people of Sawtooth, Montana, to think that they’re safe when they’re anything but.
That’s where Weaver Grant comes in.